<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator="/" separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>用户管理</el-breadcrumb-item>
      <el-breadcrumb-item>用户列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区 -->
    <el-card>
      <!-- 警告提示信息 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数"
        type="warning" show-icon :closable="false">
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>请选择商品分类：</span>
          <!-- 选择商品的级联选择框 -->
          <el-cascader
            v-model="selectedCatKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"></el-cascader>
        </el-col>
      </el-row>
      <!-- tabs选择区 -->
      <template>
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
          <!-- 添加动态参数的面板 -->
          <el-tab-pane label="动态参数" name="many">
            <!-- 添加参数按钮 -->
            <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
            <!-- 动态参数表格 -->
            <el-table :data="manyTableData" border stripe>
              <!-- 展开行 -->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!-- 循环渲染tag标签 -->
                  <el-tag closable v-for="(item,i) in scope.row.attr_vals" :key="i" @close="handleClose(i, scope.row)">
                  {{item}}
                  </el-tag>
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
              <!-- 索引列 -->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="参数名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParamsById(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
          <!-- 添加静态属性的面板 -->
          <el-tab-pane label="静态属性" name="only">
            <!-- 添加属性按钮 -->
            <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
            <!-- 静态参数表格 -->
            <el-table :data="onlyTableData" border stripe>
              <!-- 展开行 -->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!-- 循环渲染tag标签 -->
                  <el-tag closable v-for="(item, i) in scope.row.attr_vals" :key="i" @close="handleClose(i, scope.row)">
                    {{item}}
                  </el-tag>
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
              <!-- 索引列 -->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="参数名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParamsById(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
        </el-tabs>
      </template>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%" @close="addDialogClosed">
      <!-- 添加参数的表单 -->
      <el-form ref="addFormRef" :model="addForm" label-width="100px" :rules="addFormRules">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%" @close="editDialogClosed">
      <!--修改参数的表单 -->
      <el-form ref="editFormRef" :model="editForm" label-width="100px" :rules="editFormRules">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 绑定商品分类数据的列表对象
      cateList: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        expandTrigger: 'hover',
        children: 'children'
      },
      // 绑定选择对象的数组
      selectedCatKeys: [],
      // 被激活的页签名称
      activeName: 'many',
      // 动态参数表格的数据
      manyTableData: [],
      // 静态属性表格的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单对象
      addForm: {
        attr_name: ''
      },
      // 添加参数的校验对象
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 修改参数表格的对象
      editForm: {
        attr_name: ''
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改参数的校验对象
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类数据的方法
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.cateList = res.data
      console.log(res)
    },
    // 级联选择框选择项变化，会触发这个函数
    async handleChange() {
      this.getParamsData()
    },
    // 页签选中的处理函数
    handleTabClick() {
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedCatKeys.length !== 3) {
        this.selectedCatKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      console.log('this.selectedCatKeys:' + this.selectedCatKeys)
      // 证明选中的是三级分类,根据选中的id和面板获取相应的数据
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      // 将以空格进行划分的字符串拆分成数组
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async validate => {
        if (!validate) {
          return null
        } else {
          const { data: res } = await this.$http.post(
            `categories/${this.cateId}/attributes`, { attr_name: this.addForm.attr_name, attr_sel: this.activeName }
          )
          if (res.meta.status !== 201) {
            return this.$message.error(res.meta.msg)
          }
          this.$message.success(res.meta.msg)
          this.addDialogVisible = false
          this.getParamsData()
        }
      })
    },
    // 监听对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 展示修改对话框
    async showEditDialog(attrId) {
      // 查询修改对话框展示的参数信息
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attrId}`, {
          params: { attr_sel: this.activeName }
        })
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 提交修改好的信息
    editParams() {
      this.$refs.editFormRef.validate(async validate => {
        if (!validate) {
          return
        }
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
        )
        if (res.meta.status !== 200) {
          return this.$message.error(res.meta.msg)
        }
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 通过id删除对应的参数项
    async removeParamsById(id) {
      const confirmResult = await this.$confirm('此操作将永久删除该用户，是否继续？', '提示', { confirmButtonText: '确定', cancelButtonText: '取消', type: 'warning' }).catch(err => err)
      // 用户取消了删除的操作
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${id}`)
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.$message.success(res.meta.msg)
      this.getParamsData()
    },
    // 文本框失去焦点，或摁下Enter都会触发
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return null
      }
      // 如果没有return，则证明输入的内容需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    // 控制文本值的切换
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获取焦点
      // $nextTick方法的作用：就是党页面上的元素被重新渲染后，才会指定回调函数中的代码
      this.$nextTick(_ => { this.$refs.saveTagInput.$refs.input.focus() })
    },
    // 处理标签的删除事件
    async handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    },
    // 将对attr_vals的操作，保存到数据
    async saveAttrVals(row) {
      // 需要发起请求，保存此次想修改操作
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`, {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.$message.success(res.meta.msg)
    }
  },
  // 计算属性
  computed: {
    // 如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedCatKeys.length !== 3) {
        return true
      }
      return false
    },
    // 获取当前选中的三级分类的id
    cateId() {
      if (this.selectedCatKeys.length === 3) {
        console.log('分类参数id:' + this.selectedCatKeys[2])
        return this.selectedCatKeys[2]
      }
      return null
    },
    // 动态计算添加参数的对话框的title属性
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}

.el-tag {
  margin: 10px;
}

.input-new-tag {
  width: 200px;
}
</style>
